#include <bits/stdc++.h>
using namespace std;

int gcd(int a,int b)
{
	if(b==0)
	{
		return a;
	}
	else
	{
		return gcd(b,a%b);
	}
}

int main()
{
	int a;
	int b;
	cin >> a >> b;
	cout << gcd(a,b) << endl;
	return 0;
}
